* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;

}

header {
    width: 100%;
    height: 80px;
    background-color: white;
    box-shadow: 0px 5px 10px 0px rgb(230, 233, 238);
}

main {
    margin-top: 25px;


    width: 100%;

}

.main-center {
    height: 80%;
    width: 90%;
    margin: auto;
    background-color: white;
}

.submit {

    padding: 20px;
}

.submit input {
    margin: 10px;
    height: 35px;
    width: 150px;
    outline: none;
    font-size: 14px;
}

table {
    text-align: center;
    margin: auto;
    table-layout: fixed;
    border-collapse: collapse;
}

td{
    height: 45px;
}

.operation {
    margin: auto;
    position: fixed;
    height: 400px;
    width: 500px;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    border-radius: 10px;
    background-color: white;
}

.operation-header {
    border-bottom: 2px solid rgb(235, 235, 233);
    background-color: rgb(251, 251, 250);
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
}

#masking {
    position: absolute;
    top: 80px;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
}

.operation-main{
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin: 15px;
}

.operation-main input {
    
    height: 25px;
    width: 200px;
    border: none;
    outline: none;
    margin: 5px;
    padding-left: 10px;
    border: 1px solid black;
}
label{
    width: 70px;
    text-align: right;
    display: inline-block;
}